Originally Posted by bygddy
And yet up top......
Recently had a similar error by Summit. A guy posted a Pontiac (IIRC) piston p/n he was going to order that ended with -060
, but he thought the piston was a standard size- like the info on Summit's site said it was. Obviously a mistake, but to someone new to it all, it went right over his head and would have cost him a lot of time and trouble had it not been caught.
I don't get why suddenly some have seemingly forgotten the rules of thumb that go along w/CR and octane. C'mon guys! Ain't no free lunch, don't matter how much cam you throw at it.
I do believe DCR has its place. But when you go way outside the box, it will break down.
As far as errors caused by the advertised vs. actual seat to seat timing, etc., if you run the numbers both ways, you'll see there's not that much difference in the results. The only way it would matter is if the combo was right at the limit, and that's risky no matter how you look at it.
Lastly, IMHO losing a couple tenths of a point of CR to stay safe is MUCH preferable than to run less than best timing. A couple degrees of timing can cost 50-plus HP in the blink of an eye. .5:1 CR has been estimated to be worth ~2%, or 10 HP on a 500 HP build. I know which one I would choose.